PHIL 1010 Lecture Notes - Lecture 2: Modus Tollens
7 Aug 2014
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Thus, socrates is mortal (conclusion: notice that the term argument , as we have defined it, applies to bad arguments as well as good arguments, the premises imply the conclusion, then the argument in question is a good one all true conclusion must be true if the premises are true, an argument is deductively valid so long as the argument is such that the, arguments can be valid or invalid, sentences can be true or false, to say an argument is valid it is saying that it is a good argument, a sound argument is an argument which is valid and whose premises are, an invalid argument, by contrast, is one in which it is possible for the, to say that an argument is valid is to say that if the premises are true, then premises all to be true but the conclusion false the conclusion must be true.
